Re: fix daisy chain

[dempson@actrix.gen.nz (David Empson)]

<chuck_m_s57@my-dejanews.com> wrote:

> I know this question has been ask before but i've never seen the answer.I
> have two apple II 3.5 drives model no. A9M0106 one will daisy chain and the
> other won't.I hookup the 3.5 drives first in line like I've read you
> should.The other drive did work but I did what it say not to do on the cord.I
> didn't power off the computer before disconnecting and connecting drives.It
> didn't short anything out it still work as a single drive.The computer just
> doesn't read any drive on the otherside of it.There must be some kind of on
> board bios that got erased.Is there any way to reprogram the daisy chain?

It sounds like you've damaged something on the daisy chain board inside
the drive.  There is no "bios" - no intelligence of any kind on this
board.

It has very simple componentry and is mostly just passing signals
through with some being relocated.  I haven't looked at one for a while,
and I don't recall if it has any chips on it - I seem to recall that it
only had discrete components (resistors and so forth).


A question: have you tried daisy-chaining any other type of drive?  It
might just be unable to support a daisy-chained Apple 3.5 drive.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand